refactor: remove silly looking fold #28860

Job	Run time
Nix (macos-latest)	1m 53s
Build (macos-latest, 5.1.x)	13m 35s
Nix (ubuntu-latest)	51s
Coq 8.16.1	7m 20s
Build (ubuntu-latest, 5.1.x)	8m 53s
Build (ocaml-variants.5.3.0+trunk, ubuntu-latest, true)	5m 21s
Build (4.14.x, ubuntu-latest, true)	1m 39s
Documentation	48s
Coverage (5.1.x)	9m 41s
Build (4.14.x, macos-latest, true)	2m 24s
Build (5.1.x, macos-13, true)	4m 8s
Build (ocaml-base-compiler.4.14.2,system-msvc, windows-latest)	16m 19s
Format	1m 2s
Build monorepo benchmark docker image	3m 56s
Build (ocaml-base-compiler.5.1.1,system-mingw, windows-latest)	10m 17s
Build (4.08.x, ubuntu-latest, true)	1m 39s
Build microbenchmarks	2m 20s
Build (4.04.x, ubuntu-latest, true, true)	4m 41s
Create local opam switch (macos-latest, 5)	5m 31s
Build (4.02.x, ubuntu-latest, true)	4m 2s
Create local opam switch (macos-latest, 4.14)	5m 30s
Create local opam switch (ubuntu-latest, 5)	4m 58s
Create local opam switch (ubuntu-latest, 4.14)	4m 51s
	2h 1m 39s

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